This is what makes the news that a tribe in the Amazon—the Matsés peoples of Brazil and Peru—have created a 500-page encyclopedia of their traditional medicine all the more remarkable. The encyclopedia, compiled by five shamans with assistance from conservation group Acaté, details every plant used by Matsés medicine to cure a massive variety of ailments. "The [Matsés Traditional Medicine Encyclopedia] marks the first time shamans of an Amazonian tribe have created a full and complete transcription of their medicinal knowledge written in their own language and words," Christopher Herndon, president and co-founder of Acaté, told Mongabay in an interview .

The Matsés have only printed their encyclopedia in their native language to ensure that the medicinal knowledge is not stolen by corporations or researchers as has happened in the past. Instead, the encyclopedia is meant as a guide for training new, young shamans in the tradition and recording the living shamans' knowledge before they pass. "One of the most renowned elder Matsés healers died before his knowledge could be passed on so the time was now. Acaté and the Matsés leadership decided to prioritize the Encyclopedia before more of the elders were lost and their ancestral knowledge taken with them," said Herndon.

Acaté has also started a program connecting the remaining Matsés shamans with young students. Through this mentorship program, the indigenous people hope to preserve their way of life as they have for centuries past.

"With the medicinal plant knowledge disappearing fast among most indigenous groups and no one to write it down, the true losers in the end are tragically the indigenous stakeholders themselves," said Herndon. "The methodology developed by the Matsés and Acaté can be a template for other indigenous cultures to safeguard their ancestral knowledge."